Home / FAQ
  • Q:
    Swelling (Air trapped inside the shrink film)
    A:
    1. Increase vent holes: Add more vent holes to accelerate air evacuation from inside the film.
    2. Reduce conveyor speed: Slow down the belt to extend the air evacuation time.
    3. Increase tunnel temperature: Raise the operating temperature to facilitate smooth air escape.
  • Q:
    Hazing (Foggy or cloudy appearance on the film surface)
    A:
    1. Reduce tunnel temperature: Excessively high temperature is the primary cause of film hazing.
    2. Increase conveyor speed: Speed up the belt to shorten the film's heat exposure time.
  • Q:
    Weak Seal Strength (Seam tears easily or has pinholes)
    A:
    1. Lower sealing bar temperature: Reduce the heat applied by the sealing jaws.
    2. Adjust sealing height: Ensure the sealing line is positioned precisely at half the height of the packaged product.
    3. Even out sealing pressure: Adjust the levelness of the sealing frame to ensure uniform pressure.
    4. Clean sealing components: Thoroughly clean both the sealing bars and the sealing base.
    5. Replace damaged insulation: Replace worn-out silicone rubber pads or strips on the sealing base.
    6. Extend sealing duration: Increase the sealing dwell time, as the pressure may have released before the fusion was complete.
  • Q:
    Fish Eyes (Fish-eye shaped wrinkles on the film surface)
    A:
    1. Increase tunnel temperature: Adjust the temperature control parameters higher.
    2. Reduce conveyor speed: Slow down the belt running rate.
    3. Increase circulating airflow: Enhance the air output of the tunnel fans.
  • Q:
    Fishtail Wrinkles (Continuous pleats appearing at the film corners)
    A:
    1. Reduce vent holes: Excessive ventilation causes rapid heat loss, leading to incomplete film shrinkage.
    2. Reduce conveyor speed: Slow down the belt speed.
    3. Increase tunnel temperature: Raise the heating temperature.
    4. Increase circulating airflow: Boost the fan circulation output.
  • Q:
    Dog Ears (Triangular film protrusions at the product corners)
    A:
    1. Downsize shrink bags: Switch to a smaller sized shrink bag.
    2. Reduce conveyor speed: Slow down the belt speed.
    3. Reduce circulating airflow: Lower the fan circulation output.
    4. Increase tunnel temperature: Raise the operating temperature.
  • Q:
    Misaligned Sealing Position
    A:
    1. Correct sealing line height: The sealing line must be set at half the height of the packaged product.
    2. Adjust conveyor height: Set the conveyor belt to the correct height.
    3. Adjust sealing frame height: Re-level the vertical position of the sealing frame.
    4. Adjust airflow direction: Realign the hot air outlet angles inside the tunnel.
    5. Downsize shrink bags: Use smaller shrink bags to prevent shifting during shrinking.
  • Q:
    Crushed/Deformed Products (Product warped or crushed by film tension after shrinking)
    A:
    1. Lower tunnel temperature: Reduce the heating temperature.
    2. Increase conveyor speed: Speed up the belt running rate.
    3. Upgrade shrink bags: Use a larger sized shrink bag to reduce tension.
    4. Switch film types: Replace the film with a low-tension shrink film, as the current film's shrink tension is incompatible with the product.
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